I've tried to install this mod, and I must be doing something wrong as I get nothing and now my shop just appears blank.. again

I'm running 1.3.8 and have uploaded all the latest files as suggested and following the instructions here:
http://wiki.rubikintegration.com/zen...u/installation

There'll be something I've done wrong, but I have no shop at the moment!

When I click on Extras -> SSU Manager I just get a blank page, same with the SSU check page. I tried re-uploading everything in case something messed up that way, but still the same.

Any ideas what I've done and how to fix?

Thanks

Site is www. creepy creatures online.co.uk